Summary of Significant Accounting Policies	12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Cash Equivalents We consider all highly liquid instruments with maturities of three months or less when purchased to be cash equivalents. Our cash equivalents at December 31, 2020 and 2019 consist of direct obligations of financial institutions rated A or better. Allowance for Doubtful Accounts We maintain allowances for doubtful accounts. These allowances reflect our estimate of the amount of our receivables that we will be unable to collect based on historical write-off experience and, as applicable, current conditions and reasonable and supportable forecasts that affect collectibility. Our allowance for doubtful accounts as of December 31, 2020 included an adjustment for the estimated impact of COVID-19 on future collectibility that was not material to our financial statements. Our estimate could require change based on changing circumstances, including changes in the economy or in the particular circumstances of individual customers. Accordingly, we may be required to increase or decrease our allowances. Trade receivables that have contractual maturities of one year or less are written-off when they are determined to be uncollectible based on the criteria necessary to qualify as a deduction for federal tax purposes. Write-offs of such receivables require management approval based on specified dollar thresholds. See note 3 to our consolidated financial statements for further detail. Inventory Inventory consists of new equipment, contractor supplies, tools, parts, fuel and related supply items. Inventory is stated at the lower of cost or market. Cost is determined, depending on the type of inventory, using either a specific identification, weighted-average or first-in, first-out method. Rental Equipment Rental equipment, which includes service and delivery vehicles, is recorded at cost and depreciated over the estimated useful life of the equipment using the straight-line method. The range of estimated useful lives for rental equipment is two to 20 years. Rental equipment is depreciated to a salvage value of zero to 10 percent of cost. Rental equipment is depreciated whether or not it is out on rent. Property and Equipment Property and equipment are recorded at cost and depreciated over their estimated useful lives using the straight-line method. The range of estimated useful lives for property and equipment is two to 39 years. Ordinary repair and maintenance costs are charged to expense as incurred. Leasehold improvements are amortized using the straight-line method over their estimated useful lives or the remaining life of the lease, whichever is shorter. Acquisition Accounting We have made a number of acquisitions in the past and may continue to make acquisitions in the future. The assets acquired and liabilities assumed are recorded based on their respective fair values at the date of acquisition. Long-lived assets (principally rental equipment), goodwill and other intangible assets generally represent the largest components of our acquisitions. Rental equipment is valued utilizing either a cost, market or income approach, or a combination of certain of these methods, depending on the asset being valued and the availability of market or income data. The intangible assets that we have acquired are non-compete agreements, customer relationships and trade names and associated trademarks. The estimated fair values of these intangible assets reflect various assumptions about discount rates, revenue growth rates, operating margins, terminal values, useful lives and other prospective financial information. Goodwill is calculated as the excess of the cost of the acquired entity over the net of the fair value of the assets acquired and the liabilities assumed. Non-compete agreements, customer relationships and trade names and associated trademarks are valued based on an excess earnings or income approach based on projected cash flows. Determining the fair value of the assets and liabilities acquired is judgmental in nature and can involve the use of significant estimates and assumptions. The judgments made in determining the estimated fair value assigned to the assets acquired, as well as the estimated life of the assets, can materially impact net income in periods subsequent to the acquisition through depreciation and amortization, and in certain instances through impairment charges, if the asset becomes impaired in the future. As discussed below, we regularly review for impairments. When we make an acquisition, we also acquire other assets and assume liabilities. These other assets and liabilities typically include, but are not limited to, parts inventory, accounts receivable, accounts payable and other working capital items. Because of their short-term nature, the fair values of these other assets and liabilities generally approximate the book values on the acquired entities' balance sheets. Evaluation of Goodwill Impairment Goodwill is tested for impairment annually or more frequently if an event or circumstance indicates that an impairment loss may have been incurred. Application of the goodwill impairment test requires judgment, including: the identification of reporting units; assignment of assets and liabilities to reporting units; assignment of goodwill to reporting units; determination of the fair value of each reporting unit; and an assumption as to the form of the transaction in which the reporting unit would be acquired by a market participant (either a taxable or nontaxable transaction). We estimate the fair value of our reporting units (which are our regions) using a combination of an income approach based on the present value of estimated future cash flows and a market approach based on market price data of shares of our Company and other corporations engaged in similar businesses as well as acquisition multiples paid in recent transactions within our industry (including our own acquisitions). We believe this approach, which utilizes multiple valuation techniques, yields the most appropriate evidence of fair value. As discussed below (see "Guidance Adopted in 2020-Simplifying the Test for Goodwill Impairment"), in 2020, we adopted accounting guidance that eliminated the second step from the goodwill impairment test (this guidance did not have a significant impact on our financial statements). Prior guidance required utilizing a two-step process to review goodwill for impairment. A second step was required if there was an indication that an impairment may exist, and the second step required calculating the potential impairment by comparing the implied fair value of the reporting unit's goodwill (as if purchase accounting were performed on the testing date) with the carrying amount of the goodwill. We did not perform this second step for the goodwill impairment test conducted as of October 1, 2020 or 2019 (for 2020, because the adopted accounting guidance eliminated the second step, and, for 2019, because there was no indication that an impairment may have existed). The first step of the impairment test requires comparing the fair value of a reporting unit with its carrying amount. Financial Accounting Standards Board ("FASB") guidance permits entities to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. In connection with our goodwill impairment test that was conducted as of October 1, 2020, we bypassed the qualitative assessment for each reporting unit and quantitatively compared the fair values of our reporting units with their carrying amounts. We considered the impact of COVID-19 when performing the test, and it did not have a material impact on the test results. Our goodwill impairment testing as of this date indicated that all of our reporting units, excluding our Fluid Solutions Europe reporting unit, had estimated fair values which exceeded their respective carrying amounts by at least 42 percent. As discussed above, in July 2018, we completed the acquisition of BakerCorp. All of the assets in the Fluid Solutions Europe reporting unit were acquired in the BakerCorp acquisition. The estimated fair value of our Fluid Solutions Europe reporting unit exceeded its carrying amount by 22 percent. As all of the assets in the Fluid Solutions Europe reporting unit were recorded at fair value as of the July 2018 acquisition date, we expected the percentage by which the Fluid Solutions Europe reporting unit’s fair value exceeded its carrying value to be significantly less than the equivalent percentages determined for our other reporting units. In connection with our goodwill impairment test that was conducted as of October 1, 2019, we bypassed the qualitative assessment for each reporting unit and proceeded directly to the first step of the goodwill impairment test. Our goodwill impairment testing as of this date indicated that all of our reporting units, excluding our Fluid Solutions Europe reporting unit, had estimated fair values which exceeded their respective carrying amounts by at least 32 percent. As discussed above, in July 2018, we completed the acquisition of BakerCorp. All of the assets in the Fluid Solutions Europe reporting unit were acquired in the BakerCorp acquisition. The estimated fair value of our Fluid Solutions Europe reporting unit exceeded its carrying amount by 12 percent. As all of the assets in the Fluid Solutions Europe reporting unit were recorded at fair value as of the July 2018 acquisition date, we expected the percentage by which the Fluid Solutions Europe reporting unit’s fair value exceeded its carrying value to be significantly less than the equivalent percentages determined for our other reporting units. Restructuring Charges Costs associated with exit or disposal activities, including lease termination costs and certain employee severance costs associated with restructuring, branch closings or other activities, are recognized at fair value when they are incurred. Other Intangible Assets Other intangible assets consist of non-compete agreements, customer relationships and trade names and associated trademarks. The non-compete agreements are being amortized on a straight-line basis over initial periods of approximately 5 years. The customer relationships are being amortized either using the sum of the years' digits method or on a straight-line basis over initial periods ranging from 5 to 15 years. The trade names and associated trademarks are being amortized using the sum of the years' digits method over initial periods of approximately 5 years. We believe that the amortization methods used reflect the estimated pattern in which the economic benefits will be consumed. Long-Lived Assets Long-lived assets are recorded at the lower of amortized cost or fair value. As part of an ongoing review of the valuation of long-lived assets, we assess the carrying value of such assets if facts and circumstances suggest they may be impaired. If this review indicates the carrying value of such an asset may not be recoverable, as determined by an undiscounted cash flow analysis over the remaining useful life, the carrying value would be reduced to its estimated fair value. Translation of Foreign Currency Assets and liabilities of our foreign subsidiaries that have a functional currency other than U.S. dollars are translated into U.S. dollars using exchange rates at the balance sheet date. Revenues and expenses are translated at average exchange rates effective during the year. Foreign currency translation gains and losses are included as a component of accumulated other comprehensive (loss) income within stockholders’ equity. Revenue Recognition As discussed in note 3 to our consolidated financial statements, we recognize revenue in accordance with two different accounting standards: 1) Topic 606 (which addresses revenue from contracts with customers) and 2) Topic 842 (which addresses lease revenue). As discussed in note 13 to our consolidated financial statements, in 2019, we adopted Topic 842. Topic 842 replaced Topic 840, which was the lease accounting standard in effect for the year ended December 31, 2018. As discussed in note 3, most of our revenue is accounted for under Topic 842. The discussion below addresses our primary revenue types based on the accounting standard used to determine the accounting. Lease revenues (Topic 842) The accounting for the significant types of revenue that are accounted for under Topic 842 is discussed below. Owned equipment rentals: Owned equipment rentals represent revenues from renting equipment that we own. We account for such rentals as operating leases. Re-rent revenue: Re-rent revenue reflects revenues from equipment that we rent from vendors and then rent to our customers. We account for such rentals as subleases. The accounting for re-rent revenue is the same as the accounting for owned equipment rentals described above. Revenues from contracts with customers (Topic 606) The accounting for the significant types of revenue that are accounted for under Topic 606 is discussed below. Delivery and pick-up: Delivery and pick-up revenue associated with renting equipment is recognized when the service is performed. Sales of rental equipment, new equipment and contractor supplies are recognized at the time of delivery to, or pick-up by, the customer and when collectibility is probable. Service and other revenues primarily represent revenues earned from providing repair and maintenance services on our customers’ fleet (including parts sales). Service revenue is recognized as the services are performed. See note 3 to our consolidated financial statements for further discussion of our revenue accounting. Delivery Expense Equipment rentals include our revenues from fees we charge for equipment delivery. Delivery costs are charged to operations as incurred, and are included in cost of revenues on our consolidated statements of income. Advertising Expense We promote our business through local and national advertising in various media, including television, trade publications, branded sponsorships, yellow pages, the internet, radio and direct mail. Advertising costs are generally expensed as incurred. These costs may include the development costs for branded content and advertising campaigns. Advertising expense, net of the qualified advertising reimbursements discussed below, was immaterial for the years ended December 31, 2020, 2019 and 2018. We receive reimbursements for advertising that promotes a vendor’s products or services. Such reimbursements that meet the applicable criteria under U.S. generally accepted accounting principles (“GAAP”) are offset against advertising costs in the period in which we recognize the incremental advertising cost. The amounts of qualified advertising reimbursements that reduced advertising expense were $22, $49 and $41 for the years ended December 31, 2020, 2019 and 2018, respectively. Insurance We are insured for general liability, workers’ compensation and automobile liability, subject to deductibles or self-insured retentions per occurrence. Losses within the deductible amounts are accrued based upon the aggregate liability for reported claims incurred, as well as an estimated liability for claims incurred but not yet reported. These liabilities are not discounted. We are also self-insured for group medical claims but purchase “stop loss” insurance as protection against any one significant loss. Income Taxes We use the liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities and are measured using the tax rates and laws that are expected to be in effect when the differences are expected to reverse. Recognition of deferred tax assets is limited to amounts considered by management to be more likely than not to be realized in future periods. The most significant positive evidence that we consider in the recognition of deferred tax assets is the expected reversal of cumulative deferred tax liabilities resulting from book versus tax depreciation of our rental equipment fleet that is well in excess of the deferred tax assets. We use a two-step approach for recognizing and measuring tax benefits taken or expected to be taken in a tax return regarding uncertainties in income tax positions. The first step is recognition: we determine whether it is more likely than not that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, we presume that the position will be examined by the appropriate taxing authority with full knowledge of all relevant information. The second step is measurement: a tax position that meets the more-likely-than-not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Differences between tax positions taken in a tax return and amounts recognized in the financial statements will generally result in one or more of the following: an increase in a liability for income taxes payable, a reduction of an income tax refund receivable, a reduction in a deferred tax asset or an increase in a deferred tax liability. We have historically considered the undistributed earnings of our foreign subsidiaries to be indefinitely reinvested, and, accordingly, no taxes were provided on such earnings prior to the fourth quarter of 2020. In the fourth quarter of 2020, we identified $135 of cash in our foreign operations in excess of near-term working capital needs, and determined that this amount could no longer be considered indefinitely reinvested. As a result, our prior assertion that all undistributed earnings of our foreign subsidiaries should be considered indefinitely reinvested has changed, and, in the fourth quarter of 2020, we recorded the immaterial taxes on a distribution of the $135 of cash. We continue to expect that the remaining balance of our undistributed foreign earnings will be indefinitely reinvested. If we determine that all or a portion of such foreign earnings are no longer indefinitely reinvested, we may be subject to additional foreign withholding taxes and U.S. state income taxes. The Tax Cuts and Jobs Act (the "Tax Act") was enacted in December 2017, and required a one-time transition tax for deemed repatriation of accumulated undistributed earnings of certain foreign investments, which we primarily recognized upon adoption of the Tax Act in 2017. As discussed in note 14 to the consolidated financial statements, we completed our accounting for the tax effects of enactment of the Tax Act in 2018. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant estimates impact the calculation of the allowance for doubtful accounts, depreciation and amortization, income taxes and reserves for claims. Actual results could materially differ from those estimates. Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk include cash and cash equivalents and accounts receivable. We maintain cash and cash equivalents with high quality financial institutions. Concentration of credit risk with respect to receivables is limited because a large number of geographically diverse customers makes up our customer base (see note 3 to our consolidated financial statements for further detail). We manage credit risk through credit approvals, credit limits and other monitoring procedures. Stock-Based Compensation We measure stock-based compensation at the grant date based on the fair value of the award and recognize stock-based compensation expense over the requisite service period. Determining the fair value of stock option awards requires judgment, including estimating stock price volatility and expected option life. Restricted stock awards are valued based on the fair value of the stock on the grant date and the related compensation expense is recognized over the service period. Similarly, for time-based restricted stock awards subject to graded vesting, we recognize compensation cost on a straight-line basis over the requisite service period. For performance-based restricted stock units ("RSUs"), compensation expense is recognized if satisfaction of the performance condition is considered probable. We recognize forfeitures of stock-based compensation as they occur. New Accounting Pronouncements Simplifying the Accounting for Income Taxes. In December 2019, the FASB issued guidance intended to simplify the accounting for income taxes. The guidance removes the following exceptions: 1) exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items, 2) exception to the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) exception to the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary and 4) exception to the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. Additionally, the guidance simplifies the accounting for income taxes by: 1) requiring that an entity recognize a franchise tax (or similar tax) that is partially based on income as an income-based tax and account for any incremental amount incurred as a non-income-based tax, 2) requiring that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should be considered a separate transaction, 3) specifying that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements (although the entity may elect to do so (on an entity-by-entity basis) for a legal entity that is both not subject to tax and disregarded by the taxing authority), 4) requiring that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date and 5) making minor improvements for income tax accounting related to employee stock ownership plans and investments in qualified affordable housing projects accounted for using the equity method. The guidance will be effective for fiscal years and interim periods beginning after December 15, 2020. Different components of the guidance require retrospective, modified retrospective or prospective adoption, and early adoption is permitted. We will adopt this guidance when it becomes effective, in the first quarter of 2021, and the impact on our financial statements is not expected to be material. Guidance Adopted in 2020 Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued guidance that requires companies to present certain financial assets net of the amount expected to be collected. Trade receivables (as noted below, excluding receivables arising from operating lease revenues) are the only material financial asset we have that is impacted by this guidance. The guidance requires the measurement of expected credit losses to be based on relevant information from past events, including historical experiences, current conditions and reasonable and supportable forecasts that affect collectibility. This guidance does not apply to receivables arising from operating lease revenues. As discussed in note 3 to the consolidated financial statements, most of our equipment rental revenue is accounted for as lease revenue (such revenue represented 77 percent of our total revenues for the year ended December 31, 2020). We adopted this guidance in 2020, and the impact of adoption on our financial statements was not material. See note 3 (see "Receivables and contract assets and liabilities") for further discussion of our receivables. Facilitation of the Effects of Reference Rate Reform on Financial Reporting. In March 2020, the FASB issued guidance that provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) or by another reference rate expected to be discontinued. We adopted this guidance in 2020, and the impact of adoption on our financial statements was not material. The expedients and exceptions in this guidance are optional, and we are evaluating the potential future financial statement impact of any such expedient or exception that we may elect to apply. Simplifying the Test for Goodwill Impairment. In January 2017, the Financial Accounting Standards Board ("FASB") issued guidance intended to simplify the subsequent accounting for goodwill acquired in a business combination. Prior guidance required utilizing a two-step process to review goodwill for impairment. A second step was required if there was an indication that an impairment may exist, and the second step required calculating the potential impairment by comparing the implied fair value of the reporting unit's goodwill (as if purchase accounting were performed on the testing date) with the carrying amount of the goodwill. The new guidance eliminates the second step from the goodwill impairment test. Under the new guidance, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value (although the loss should not exceed the total amount of goodwill allocated to the reporting unit). The guidance requires prospective adoption. We adopted the guidance for the goodwill impairment test that we conducted as of October 1, 2020, and adoption of the guidance did not have a significant impact on our financial statements.

We maintain allowances for doubtful accounts. These allowances reflect our estimate of the amount of our receivables that we will be unable to collect based on historical write-off experience and, as applicable, current conditions and reasonable and supportable forecasts that affect collectibility. Our allowance for doubtful accounts as of December 31, 2020 included an adjustment for the estimated impact of COVID-19 on future collectibility that was not material to our financial statements. Our estimate could require change based on changing circumstances, including changes in the economy or in the particular circumstances of individual customers. Accordingly, we may be required to increase or decrease our allowances. Trade receivables that have contractual maturities of one year or less are written-off when they are determined to be uncollectible based on the criteria necessary to qualify as a deduction for federal tax purposes. Write-offs of such receivables require management approval based on specified dollar thresholds. See note 3 to our consolidated financial statements for further detail.

Inventory consists of new equipment, contractor supplies, tools, parts, fuel and related supply items. Inventory is stated at the lower of cost or market. Cost is determined, depending on the type of inventory, using either a specific identification, weighted-average or first-in, first-out method.

Rental equipment, which includes service and delivery vehicles, is recorded at cost and depreciated over the estimated useful life of the equipment using the straight-line method. The range of estimated useful lives for rental equipment is two to 20 years. Rental equipment is depreciated to a salvage value of zero to 10 percent of cost. Rental equipment is depreciated whether or not it is out on rent.

Property and equipment are recorded at cost and depreciated over their estimated useful lives using the straight-line method. The range of estimated useful lives for property and equipment is two to 39 years. Ordinary repair and maintenance costs are charged to expense as incurred. Leasehold improvements are amortized using the straight-line method over their estimated useful lives or the remaining life of the lease, whichever is shorter.

We have made a number of acquisitions in the past and may continue to make acquisitions in the future. The assets acquired and liabilities assumed are recorded based on their respective fair values at the date of acquisition. Long-lived assets (principally rental equipment), goodwill and other intangible assets generally represent the largest components of our acquisitions. Rental equipment is valued utilizing either a cost, market or income approach, or a combination of certain of these methods, depending on the asset being valued and the availability of market or income data. The intangible assets that we have acquired are non-compete agreements, customer relationships and trade names and associated trademarks. The estimated fair values of these intangible assets reflect various assumptions about discount rates, revenue growth rates, operating margins, terminal values, useful lives and other prospective financial information. Goodwill is calculated as the excess of the cost of the acquired entity over the net of the fair value of the assets acquired and the liabilities assumed. Non-compete agreements, customer relationships and trade names and associated trademarks are valued based on an excess earnings or income approach based on projected cash flows.

Determining the fair value of the assets and liabilities acquired is judgmental in nature and can involve the use of significant estimates and assumptions. The judgments made in determining the estimated fair value assigned to the assets acquired, as well as the estimated life of the assets, can materially impact net income in periods subsequent to the acquisition through depreciation and amortization, and in certain instances through impairment charges, if the asset becomes impaired in the future. As discussed below, we regularly review for impairments.

When we make an acquisition, we also acquire other assets and assume liabilities. These other assets and liabilities typically include, but are not limited to, parts inventory, accounts receivable, accounts payable and other working capital items. Because of their short-term nature, the fair values of these other assets and liabilities generally approximate the book values on the acquired entities' balance sheets.

Goodwill is tested for impairment annually or more frequently if an event or circumstance indicates that an impairment loss may have been incurred. Application of the goodwill impairment test requires judgment, including: the identification of reporting units; assignment of assets and liabilities to reporting units; assignment of goodwill to reporting units; determination of the fair value of each reporting unit; and an assumption as to the form of the transaction in which the reporting unit would be acquired by a market participant (either a taxable or nontaxable transaction).

We estimate the fair value of our reporting units (which are our regions) using a combination of an income approach based on the present value of estimated future cash flows and a market approach based on market price data of shares of our Company and other corporations engaged in similar businesses as well as acquisition multiples paid in recent transactions within our industry (including our own acquisitions). We believe this approach, which utilizes multiple valuation techniques, yields the most appropriate evidence of fair value.

As discussed below (see "Guidance Adopted in 2020-Simplifying the Test for Goodwill Impairment"), in 2020, we adopted accounting guidance that eliminated the second step from the goodwill impairment test (this guidance did not have a significant impact on our financial statements). Prior guidance required utilizing a two-step process to review goodwill for impairment. A second step was required if there was an indication that an impairment may exist, and the second step required calculating the potential impairment by comparing the implied fair value of the reporting unit's goodwill (as if purchase accounting were performed on the testing date) with the carrying amount of the goodwill. We did not perform this second step for the goodwill impairment test conducted as of October 1, 2020 or 2019 (for 2020, because the adopted accounting guidance eliminated the second step, and, for 2019, because there was no indication that an impairment may have existed). The first step of the impairment test requires comparing the fair value of a reporting unit with its carrying amount. Financial Accounting

In connection with our goodwill impairment test that was conducted as of October 1, 2020, we bypassed the qualitative assessment for each reporting unit and quantitatively compared the fair values of our reporting units with their carrying amounts. We considered the impact of COVID-19 when performing the test, and it did not have a material impact on the test results. Our goodwill impairment testing as of this date indicated that all of our reporting units, excluding our Fluid Solutions Europe reporting unit, had estimated fair values which exceeded their respective carrying amounts by at least 42 percent. As discussed above, in July 2018, we completed the acquisition of BakerCorp. All of the assets in the Fluid Solutions Europe reporting unit were acquired in the BakerCorp acquisition. The estimated fair value of our Fluid Solutions Europe reporting unit exceeded its carrying amount by 22 percent. As all of the assets in the Fluid Solutions Europe reporting unit were recorded at fair value as of the July 2018 acquisition date, we expected the percentage by which the Fluid Solutions Europe reporting unit’s fair value exceeded its carrying value to be significantly less than the equivalent percentages determined for our other reporting units.

In connection with our goodwill impairment test that was conducted as of October 1, 2019, we bypassed the qualitative assessment for each reporting unit and proceeded directly to the first step of the goodwill impairment test. Our goodwill impairment testing as of this date indicated that all of our reporting units, excluding our Fluid Solutions Europe reporting unit, had estimated fair values which exceeded their respective carrying amounts by at least 32 percent. As discussed above, in July 2018, we completed the acquisition of BakerCorp. All of the assets in the Fluid Solutions Europe reporting unit were acquired in the BakerCorp acquisition. The estimated fair value of our Fluid Solutions Europe reporting unit exceeded its carrying amount by 12 percent. As all of the assets in the Fluid Solutions Europe reporting unit were recorded at fair value as of the July 2018 acquisition date, we expected the percentage by which the Fluid Solutions Europe reporting unit’s fair value exceeded its carrying value to be significantly less than the equivalent percentages determined for our other reporting units.

Other intangible assets consist of non-compete agreements, customer relationships and trade names and associated trademarks. The non-compete agreements are being amortized on a straight-line basis over initial periods of approximately 5 years. The customer relationships are being amortized either using the sum of the years' digits method or on a straight-line basis over initial periods ranging from 5 to 15 years. The trade names and associated trademarks are being amortized using the sum of the years' digits method over initial periods of approximately 5 years. We believe that the amortization methods used reflect the estimated pattern in which the economic benefits will be consumed.

Long-lived assets are recorded at the lower of amortized cost or fair value. As part of an ongoing review of the valuation of long-lived assets, we assess the carrying value of such assets if facts and circumstances suggest they may be impaired. If this review indicates the carrying value of such an asset may not be recoverable, as determined by an undiscounted cash flow analysis over the remaining useful life, the carrying value would be reduced to its estimated fair value.

Assets and liabilities of our foreign subsidiaries that have a functional currency other than U.S. dollars are translated into U.S. dollars using exchange rates at the balance sheet date. Revenues and expenses are translated at average exchange rates effective during the year. Foreign currency translation gains and losses are included as a component of accumulated other comprehensive (loss) income within stockholders’ equity.

As discussed in note 3 to our consolidated financial statements, we recognize revenue in accordance with two different accounting standards: 1) Topic 606 (which addresses revenue from contracts with customers) and 2) Topic 842 (which addresses lease revenue). As discussed in note 13 to our consolidated financial statements, in 2019, we adopted Topic 842. Topic 842 replaced Topic 840, which was the lease accounting standard in effect for the year ended December 31, 2018. As discussed in note 3, most of our revenue is accounted for under Topic 842. The discussion below addresses our primary revenue types based on the accounting standard used to determine the accounting.

Re-rent revenue: Re-rent revenue reflects revenues from equipment that we rent from vendors and then rent to our customers. We account for such rentals as subleases. The accounting for re-rent revenue is the same as the accounting for owned equipment rentals described above.

We promote our business through local and national advertising in various media, including television, trade publications, branded sponsorships, yellow pages, the internet, radio and direct mail. Advertising costs are generally expensed as incurred. These costs may include the development costs for branded content and advertising campaigns. Advertising expense, net of the qualified advertising reimbursements discussed below, was immaterial for the years ended December 31, 2020, 2019 and 2018.

We receive reimbursements for advertising that promotes a vendor’s products or services. Such reimbursements that meet the applicable criteria under U.S. generally accepted accounting principles (“GAAP”) are offset against advertising costs in the period in which we recognize the incremental advertising cost. The amounts of qualified advertising reimbursements that reduced advertising expense were $22, $49 and $41 for the years ended December 31, 2020, 2019 and 2018, respectively.

We are insured for general liability, workers’ compensation and automobile liability, subject to deductibles or self-insured retentions per occurrence. Losses within the deductible amounts are accrued based upon the aggregate liability for reported claims incurred, as well as an estimated liability for claims incurred but not yet reported. These liabilities are not discounted. We are also self-insured for group medical claims but purchase “stop loss” insurance as protection against any one significant loss.

We use the liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities and are measured using the tax rates and laws that are expected to be in effect when the differences are expected to reverse. Recognition of deferred tax assets is limited to amounts considered by management to be more likely than not to be realized in future periods. The most significant positive evidence that we consider in the recognition of deferred tax assets is the expected reversal of cumulative deferred tax liabilities resulting from book versus tax depreciation of our rental equipment fleet that is well in excess of the deferred tax assets.

We use a two-step approach for recognizing and measuring tax benefits taken or expected to be taken in a tax return regarding uncertainties in income tax positions. The first step is recognition: we determine whether it is more likely than not that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based

on the technical merits of the position. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, we presume that the position will be examined by the appropriate taxing authority with full knowledge of all relevant information. The second step is measurement: a tax position that meets the more-likely-than-not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Differences between tax positions taken in a tax return and amounts recognized in the financial statements will generally result in one or more of the following: an increase in a liability for income taxes payable, a reduction of an income tax refund receivable, a reduction in a deferred tax asset or an increase in a deferred tax liability.

We have historically considered the undistributed earnings of our foreign subsidiaries to be indefinitely reinvested, and, accordingly, no taxes were provided on such earnings prior to the fourth quarter of 2020. In the fourth quarter of 2020, we identified $135 of cash in our foreign operations in excess of near-term working capital needs, and determined that this amount could no longer be considered indefinitely reinvested. As a result, our prior assertion that all undistributed earnings of our foreign subsidiaries should be considered indefinitely reinvested has changed, and, in the fourth quarter of 2020, we recorded the immaterial taxes on a distribution of the $135 of cash.

We continue to expect that the remaining balance of our undistributed foreign earnings will be indefinitely reinvested. If we determine that all or a portion of such foreign earnings are no longer indefinitely reinvested, we may be subject to additional foreign withholding taxes and U.S. state income taxes.

The Tax Cuts and Jobs Act (the "Tax Act") was enacted in December 2017, and required a one-time transition tax for deemed repatriation of accumulated undistributed earnings of certain foreign investments, which we primarily recognized upon adoption of the Tax Act in 2017. As discussed in note 14 to the consolidated financial statements, we completed our accounting for the tax effects of enactment of the Tax Act in 2018.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant estimates impact the calculation of the allowance for doubtful accounts, depreciation and amortization, income taxes and reserves for claims. Actual results could materially differ from those estimates.

Financial instruments that potentially subject us to significant concentrations of credit risk include cash and cash equivalents and accounts receivable. We maintain cash and cash equivalents with high quality financial institutions. Concentration of credit risk with respect to receivables is limited because a large number of geographically diverse customers makes up our customer base (see note 3 to our consolidated financial statements for further detail). We manage credit risk through credit approvals, credit limits and other monitoring procedures.

We measure stock-based compensation at the grant date based on the fair value of the award and recognize stock-based compensation expense over the requisite service period. Determining the fair value of stock option awards requires judgment, including estimating stock price volatility and expected option life. Restricted stock awards are valued based on the fair value of the stock on the grant date and the related compensation expense is recognized over the service period. Similarly, for time-based restricted stock awards subject to graded vesting, we recognize compensation cost on a straight-line basis over the requisite service period. For performance-based restricted stock units ("RSUs"), compensation expense is recognized if satisfaction of the performance condition is considered probable. We recognize forfeitures of stock-based compensation as they occur.

Simplifying the Accounting for Income Taxes. In December 2019, the FASB issued guidance intended to simplify the accounting for income taxes. The guidance removes the following exceptions: 1) exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items, 2) exception to the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) exception to the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary and 4) exception to the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. Additionally, the guidance simplifies the accounting for income taxes by: 1) requiring that an entity recognize a franchise tax (or similar tax) that is partially based on income as an income-based tax and account for any incremental amount incurred as a non-income-based tax, 2) requiring that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which

the book goodwill was originally recognized and when it should be considered a separate transaction, 3) specifying that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements (although the entity may elect to do so (on an entity-by-entity basis) for a legal entity that is both not subject to tax and disregarded by the taxing authority), 4) requiring that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date and 5) making minor improvements for income tax accounting related to employee stock ownership plans and investments in qualified affordable housing projects accounted for using the equity method. The guidance will be effective for fiscal years and interim periods beginning after December 15, 2020. Different components of the guidance require retrospective, modified retrospective or prospective adoption, and early adoption is permitted. We will adopt this guidance when it becomes effective, in the first quarter of 2021, and the impact on our financial statements is not expected to be material.

Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued guidance that requires companies to present certain financial assets net of the amount expected to be collected. Trade receivables (as noted below, excluding receivables arising from operating lease revenues) are the only material financial asset we have that is impacted by this guidance. The guidance requires the measurement of expected credit losses to be based on relevant information from past events, including historical experiences, current conditions and reasonable and supportable forecasts that affect collectibility. This guidance does not apply to receivables arising from operating lease revenues. As discussed in note 3 to the consolidated financial statements, most of our equipment rental revenue is accounted for as lease revenue (such revenue represented 77 percent of our total revenues for the year ended December 31, 2020). We adopted this guidance in 2020, and the impact of adoption on our financial statements was not material. See note 3 (see "Receivables and contract assets and liabilities") for further discussion of our receivables.

Facilitation of the Effects of Reference Rate Reform on Financial Reporting. In March 2020, the FASB issued guidance that provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) or by another reference rate expected to be discontinued. We adopted this guidance in 2020, and the impact of adoption on our financial statements was not material. The expedients and exceptions in this guidance are optional, and we are evaluating the potential future financial statement impact of any such expedient or exception that we may elect to apply.

Simplifying the Test for Goodwill Impairment. In January 2017, the Financial Accounting Standards Board ("FASB") issued guidance intended to simplify the subsequent accounting for goodwill acquired in a business combination. Prior guidance required utilizing a two-step process to review goodwill for impairment. A second step was required if there was an indication that an impairment may exist, and the second step required calculating the potential impairment by comparing the implied fair value of the reporting unit's goodwill (as if purchase accounting were performed on the testing date) with the carrying amount of the goodwill. The new guidance eliminates the second step from the goodwill impairment test. Under the new guidance, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value (although the loss should not exceed the total amount of goodwill allocated to the reporting unit). The guidance requires prospective adoption. We adopted the guidance for the goodwill impairment test that we conducted as of October 1, 2020, and adoption of the guidance did not have a significant impact on our financial statements.